<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="test"></div>

  <script type="text/javascript" src="../js/react.development.js"></script>
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <script type="text/javascript" src="../js/babel.min.js"></script>
  <script type="text/javascript" src="../js/prop-types.js"></script>
  <script type="text/babel">
    class Life extends React.Component{
        state = {opacity:1}
        death=()=>{
            ReactDOM.unmountComponentAtNode(document.getElementById('test'))
        }
        componentDidMount(){
            this.timer = setInterval(()=>{
                let {opacity} = this.state
                opacity -= 0.1
                if(opacity<=0){
                    opacity = 1
                }
                this.setState({opacity:opacity})
            },200)
        }
        componentWillUnmount(){
            clearInterval(this.timer)
        }
        render(){
            return (
                <div>
                    <h2 style={{opacity:this.state.opacity}}>React学不会怎么办？</h2>
                    <button onClick={this.death}>不活了</button>
                </div>
            )
        }
    }
    ReactDOM.render(<Life/>,document.getElementById('test'))
  </script>
</body>

</html>